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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (1): 64-70.doi: 10.13287/j.1001-9332.201701.005

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Effects of nitrogen addition and elevated CO2 concentration on soil dissolved organic carbon and nitrogen in rhizosphere and non-rhizosphere of Bothriochloa ischaemum

XIAO Lie1, LIU Guo-bin2, LI Peng1, XUE Sha2*   

  1. 1State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi’an University of Technology, Xi’an 710048, China
    2State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shaanxi, China
  • Received:2016-06-07 Revised:2016-10-20 Published:2017-01-18
  • Contact: *E-mail:xuesha100@163.com
  • Supported by:
    This work was supported by the Program for West Younger Scholar, Chinese Academy of Sciences (XAB2015A05) and the National Natural Science Foundation of China (41371510,41371508,41471438)

Abstract: A pot experiment was conducted to study soil dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) in the rhizosphere and non-rhizosphere of Bothriochloa ischaemum in loess hilly-gully region under the different treatments of CO2 concentrations (400 and 800 μmol·mol-1) and nitrogen addition (0, 2.5, 5.0 g N·m-2·a-1). The results showed that eleva-ted CO2 treatments had no significant effect on the contents of DOC, dissolved total nitrogen (DTN), DON, dissolved ammonium nitrogen (NH4+-N) and dissolved nitrate nitrogen (NO3--N) in the soil of rhizosphere and non-rhizosphere of B. ischaemum. The contents of DTN, DON, and NO3--N in the rhizosphere soil were significantly increased with the nitrogen application and the similar results of DTN and NO3--N also were observed in the non-rhizosphere of B. ischaemum. Nitrogen application significantly decreased DOC/DON in the rhizosphere of B. ischaemum. The contents of DTN, NO3--N and DON in the soil of rhizosphere were significantly lower than that in the non-rhizosphere soil, and DOC/DON was significantly higher in the rhizosphere soil than that in the non-rhizosphere soil. It indicated that short-term elevated CO2 concentration had no significant influence on the contents of soil dissolved organic carbon and nitrogen. Simulated nitrogen deposition, to some extent, increased the content of soil dissolved nitrogen, but it was still insufficient to meet the demand of dissolved nitrogen for plant growing.